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d) "When a message is not sent from an unknown sys- tem it is not scanned for viruses."

d) "When a message is not sent from an unknown sys- tem it is not scanned for viruses."

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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part D

b) "The message was sent from an unknown system but it was not scanned for viruses." c) "It is necessary to scan the message for viruses when- ever it was sent from an unknown system." d) "When a message is not sent from an unknown sys- tem it is not scanned for viruses."
Transcribed Image Text:b) "The message was sent from an unknown system but it was not scanned for viruses." c) "It is necessary to scan the message for viruses when- ever it was sent from an unknown system." d) "When a message is not sent from an unknown sys- tem it is not scanned for viruses."
7. Express these system specifications using the proposi- tions p: "The message is scanned for viruses" and q: "The message was sent from an unknown system" together with logical connectives (including negations). a) "The message is scanned for viruses whenever the message was sent from an unknown system."
Transcribed Image Text:7. Express these system specifications using the proposi- tions p: "The message is scanned for viruses" and q: "The message was sent from an unknown system" together with logical connectives (including negations). a) "The message is scanned for viruses whenever the message was sent from an unknown system."
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